If you're craving some mental stimulation, make sure you visit Sanada Treasure Museum. Whether it's history, culture or beliefs, you'll find lots of intriguing displays to keep your mind active here.
To visit this collection of historical artifacts, you'll need to find your way to Nagano. You'll find loads of other things to see in the area, like Nagano Olympic Stadium, M-Wave Olympic Memorial Arena, and Chausuyama Zoo.